Cascaded Multi-cycle terahertz driven ultrafast electron acceleration and manipulation
arXiv:1910.06639 · doi:10.1103/PhysRevX.10.011067
Abstract
Terahertz (THz)-based electron acceleration and manipulation has recently been shown to be feasible and to hold tremendous promise as a technology for the development of next-generation, compact electron sources. Previous work has concentrated on structures powered transversely by short, single-cycle THz pulses, with mm-scale, segmented interaction regions that are ideal for acceleration of electrons in the sub- to few-MeV range where electron velocities vary significantly. However, in order to extend this technology to the multi-MeV range, investigation of approaches supporting longer interaction lengths is needed. Here, we demonstrate first steps in electron acceleration and manipulation using dielectrically-lined waveguides powered by temporally long, narrowband, multi-cycle THz pulses that co-propagate with the electrons. This geometry offers centimeter-scale single-stage interaction lengths and offers the opportunity to further increase interaction lengths by cascading acceleration stages that recycle the THz energy and rephase the interaction. We prove the feasibility of THz-energy recycling for the first time by demonstrating acceleration, compression and focusing in two sequential Al2O3-based dielectric capillary stages powered by the same multi-cycle THz pulse. Since the multi-cycle energy achievable using laser-based sources is currently a limiting factor for the maximum electron acceleration, THz energy recycling provides a key enabling factor for reaching relativistic energies with existing sources.
22 pages, 4 figures
References in corpus (12)
- Terahertz-driven linear electron acceleration
- Laser-based acceleration of non-relativistic electrons at a dielectric structure
- Segmented Terahertz Electron Accelerator and Manipulator (STEAM)
- New electron source concept for single-shot sub-100 fs electron diffraction in the 100 keV range
- Spectral Phase Control of Interfering Chirped Pulses for High-Energy Narrowband Terahertz Generation
- Compact electron acceleration and bunch compression in THz waveguides
- Relativistic electron beam acceleration in a zero-slippage terahertz-driven Inverse Free Electron Laser scheme
- Short Electron Bunch Generation Using Single-Cycle Ultrafast Electron Guns
- Demonstration of sub-luminal propagation of single-cycle terahertz pulses for particle acceleration
- An Adiabatic Phase-Matching Accelerator
- High Efficiency Terahertz Generation in a Multi-Stage System
- Electron-Terahertz Interaction in Dielectric-Lined Waveguide Structures for Electron Manipulation